US3660090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Technique for increasing the speed of dichromated gelatin
Assignee: AT&T Inc
•
Filing: 1970-03-30
•
Granted: 1972-05-02
•
Expires: 1990-03-30
Abstract
Abstract A technique for increasing the photographic speed of dichromated gelatin destined for use in holographic system involves subjecting the gelatin to an ammonia-water vapor ambient subsequent to exposure and prior to development.
Inventors
- 👤 Robert Kryan Curran
- 👤 Lillian Ann Rankel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:56
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/22; Y; Y10; Y10S; Y10S430/00; Y10S430/146
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
14 words
A technique in accordance with claim 1 wherein said film is sensitized with (NH4)2Cr2O7.
Claim 2
Dependent Claim
20 words
A technique in accordance with claim 1 wherein exposure is effected with an argon laser whose output is 4,880 A.
Claim 3
Dependent Claim
22 words
A technique in accordance with claim 1 wherein an exposure is effected with an argon laser whose output is at 5,145 A.
Claim 4
Dependent Claim
17 words
A technique in accordance with claim 1 wherein the pH of said ammonium hydroxide solution is 10.
Claim 5
Dependent Claim
29 words
A technique in accordance with claim 5 wherein exposure to said ammonia-water vapor ambient is for ten minutes, the said substrate being heated to a temperature of 30* C.
References Cited (Backward Citations)
US1609091A
Cited
US2675315A
Cited
US2484431A
Cited
US2716060A
Cited
US2652345A
Cited
US3012886A
Cited
US3567444A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |